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A concrete highway is built of slabs 13 m long at 20 degrees Celsius. How wide should the expansion cracks between the slabs (15degrees Celsius) be to prevent buckling if the range of temperature is -30 degrees Celsius to 51 degrees Celsius.
A 73kW radio station broadcasts its signal uniformly in all directions. What is the average intensity of its signal at a distance of 300m from the antenna? I_avg=_______mW/m^2
a biophysicist grabs the ends of a dna strand with optical tweezers and stretches it 27um . how much energy is stored
a hot air balloon is ascending straight up at a constant speed of 7.0 ms. when the ballon is 12.0 m above the ground a
q1. a water-skier is moving at a speed of 14.7 ms. while she skis in the same direction as a travelling wave she
Some asteroid fragments are large enough to not completely burn up in the atmosphere and they end up on the surface of the Earth. how could you determine which type of radiation was being emitted
A 56 kg pole vaulter running at 10m/s vaults over the bar. Her speed when she is above the bar is 0.7m/s. Neglect air resistance, as well as any evergy absorbed by the pole, and determine her altitude as she crosses the bar.
consider a state function which is a superposition of two lowest eigenfunctions of the infinite square well, that is \(\psi=1/\sqrt{a}cos\pix/2a + 2/\sqrt{a}sin\psix/a\), calculate the expectation value of the kinectic energy
The particle has an average lifetime of 30.0 ns when at rest. In order to travel 10.0 m, how fast must it move
At time t = 0 s, a wheel has an angular displacement of zero radians and an angular velocity of +15 ras/s. The wheel has a constant acceleration of -0.45 rad/s2. In this situation, the maximum value of the angular displacement, in rad, is closest to:
A runner with the weight of 686.7 N accelerates at a constant rate from 0 to 45 m/s in the first 2 seconds of a 100 m sprint. What is the net force
i what is the core difference between electric and magnetic forces?ii how domaxwells equations showthis?iii how would
A wire of initial length Lo and radius ro has measured resistance of 1.0 ?. The wire is drawn under tensile stress to a new uniform radius of r = 0.25ro. What is the new resistance of the wire
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